Arrange over-plotted points in a sunflower pattern and dodge groups side-to-side

This function applies the sunflower position adjustment alongside the dodge position adjustment, arranging overlapping points per x, y, and group into a sunflower pattern. See the sunflower() documentation for more information.

Usage

position_sunflowerdodge(
  width = 1,
  density = 1,
  aspect_ratio = 1,
  orientation = "x"
)

Arguments

width

The dodging width, which defaults to 1.

density

The pattern density, which defaults to 1 but will have to be adjusted in most cases. The desirable density will depend on both the ranges of the axes and the dimensions of the image.

aspect_ratio

An aspect ratio adjustment to compensate for distortion of the circular arrangement, which might occur when plotting if coord_equal() is not used. A wide aspect ratio (e.g., 2) would adjust for vertical stretching, whereas a tall aspect ratio (e.g., 0.5) would adjust for horizontal stretching. The default aspect ratio of 1 is appropriate when no adjustment is required. Under coord_fixed(), set aspect_ratio to the same value as that function's ratio argument.

orientation

The axis along which groups are separated, either "x" (the default, side-to-side) or "y" (up and down). Matches the argument of the same name in ggplot2::position_dodge().

Value

A ggproto object of class PositionSunflowerDodge.

See also

Other Functions: impute_extreme_values(), position_bluenoise(), position_bluenoisedodge(), position_circlepack(), position_circlepackdodge(), position_honeycomb(), position_honeycombdodge(), position_jitter_ellipse(), position_jitterdodge_ellipse(), position_sunflower(), sunflower()

Examples

  library(ggplot2)

  # Use the sunflower dodge position function to arrange and dodge N points.
  N <- 300

  dat <- data.frame(
    x = sample(1:2, size = N, replace = TRUE),
    y = sample(1:7, size = N, replace = TRUE),
    type = factor(sample(LETTERS[1:2], N, replace = TRUE))
  )

  # With coord_equal
  ggplot(dat, aes(x, y, color = type, shape = type)) +
    geom_point(position = position_sunflowerdodge(width = 0.5, density = 2, aspect_ratio = 1)) +
    coord_equal()


  # Without coord_equal, might want to play with aspect ratio to get a pleasing plot
  ggplot(dat, aes(x, y, color = type, shape = type)) +
    geom_point(position = position_sunflowerdodge(width = 0.5, density = 10, aspect_ratio = 1/4))